期刊文献+
共找到21篇文章
< 1 2 >
每页显示 20 50 100
Ligand modulation of active center to promote lead-free Cs_(2)AgInCl_(6)photocatalytic CO_(2)reduction
1
作者 Baofei Sun Wei Chen +10 位作者 Yanyi Huang Daofu Wu Heng Luo Faguang Kuang Hongmei Ran yichen liu Liqin Gao Jinchen Zhou Bo Gao Qiang Huang Xiaosheng Tang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期660-669,I0015,共11页
Metal halide perovskites(MHP)are potential candidates for the photocatalytic reduction of CO_(2)due to their long photogenerated carrier lifetime and charge diffusion length.However,the conventional long-chain ligand ... Metal halide perovskites(MHP)are potential candidates for the photocatalytic reduction of CO_(2)due to their long photogenerated carrier lifetime and charge diffusion length.However,the conventional long-chain ligand impedes the adsorption and activation of CO_(2)molecules in practical applications.Here,a ligand modulation technology is employed to enhance the photocatalytic CO_(2)reduction activity of lead-free Cs_(2)AgInCl_(6)microcrystals(MCs).The Cs_(2)AgInCl_(6)MCs passivated by Oleic acid(OLA)and Octanoic acid(OCA)are used for photocatalytic CO_(2)reduction.The results show that the surface defects and electronic properties of Cs_(2)AgInCl_(6)MCs can be adjusted through ligand modulation.Compared with the OLA-Cs_(2)AgInCl_(6),the OCA-Cs_(2)AgInCl_(6)catalyst demonstrated a significant improvement in the catalytic yield of CO and CH_(4).The CO and CH_(4)catalytic yields of OCA-Cs_(2)AgInCl_(6)reached 171.88 and34.15μmol g^(-1)h^(-1)which were 2.03 and 12.98 times higher than those of OLA-Cs_(2)AgInCl_(6),and the total electron consumption rate of OCA-Cs_(2)AgInCl_(6)was 615.2μmol g^(-1)h^(-1)which was 3.25 times higher than that of OLA-Cs_(2)AgInCl_(6).Furthermore,in situ diffuse reflectance infrared Fourier transform spectra revealed the enhancement of photocatalytic activity in Cs_(2)AgInCl_(6)MCs induced by ligand modulation.This study illustrates the potential of lead-free Cs_(2)AgInCl_(6)MCs for efficient photocatalytic CO_(2)reduction and provides a ligand modulation strategy for the active promotion of MHP photocatalysts. 展开更多
关键词 Surface ligand Photocatalysis CO_(2)reduction Lead-free perovskite Reactive mechanism
下载PDF
Unconventional Designs for Functional Sodium-Sulfur Batteries 被引量:1
2
作者 Jiangfeng Ni yichen liu Sheng Zhu 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第4期405-415,共11页
Sodium-sulfur(Na–S)batteries that utilize earth-abundant materials of Na and S have been one of the hottest topics in battery research.The low cost and high energy density make them promising candidates for next-gene... Sodium-sulfur(Na–S)batteries that utilize earth-abundant materials of Na and S have been one of the hottest topics in battery research.The low cost and high energy density make them promising candidates for next-generation storage technologies as required in the grid and renewable energy.In recent years,extensive efforts have been devoted to the diversity and functionalities of Na–S batteries,aiming to extend their potential applications across multiple temporal and spatial dimensions.Here,we summarize the unconventional designs for the functionalities of Na–S batteries such as flexible batteries,solid-state cells,flame resistance,and operation at extreme temperatures.By highlighting these design strategies that help to realize the functionalities,we hope this review offers a pathway to foster the bright future of Na–S batteries in diverse applications. 展开更多
关键词 flexibility multiple functionalities sodium-sulfur batteries unconventional design
下载PDF
The Positive Effects of Physical Exercise on Mental Health Among Chinese Students Under Great Competitive Pressure
3
作者 yichen liu 《Journal of Contemporary Educational Research》 2023年第8期1-5,共5页
Under an environment full of competitive stress,students tend to form negative emotions,and the time for them to engage in physical exercise is greatly limited due to overwhelming academic tasks.Therefore,in this pape... Under an environment full of competitive stress,students tend to form negative emotions,and the time for them to engage in physical exercise is greatly limited due to overwhelming academic tasks.Therefore,in this paper,we focus on acknowledging the purpose of physical exercise,and how physical exercise affects the mental health of students under stressful circumstances but not in the context of leisure.Questionnaire was distributed to participants with an average age of 20,to investigate their preference,frequency,and reason for exercising,and their attitude towards it.Our results showed that participants think that exercise can strengthen the body,relieve stress,improve fitness and interpersonal relationship regardless of their purpose such as interests,emotional necessity and even out of non-subjective ideas.In conclusion,physical exercise helped to improve students’mental health especially under great pressure and ultimately,it will enhance their academics and bring about the unity of mind and body. 展开更多
关键词 Chinese students Physical exercise PURPOSE Positive effects Mental health
下载PDF
A Study on Yeast Using the Photoreactivation Process to Repair the Pyrimidine Dimer Mutations
4
作者 yichen liu 《Proceedings of Anticancer Research》 2023年第4期49-56,共8页
Sunlight has an indispensable importance for living things in nature[1-3].However,the direct absorption of UV will lead to the formation of pyrimidine dimers between adjacent pyrimidines in DNA strands usually in the ... Sunlight has an indispensable importance for living things in nature[1-3].However,the direct absorption of UV will lead to the formation of pyrimidine dimers between adjacent pyrimidines in DNA strands usually in the form of cyclobutene pyrimidine dimers(CPDs)and pyrimidine(6-4)pyrimidone photoproducts(6-4PPs)which causes great damage[4-6].A DNA repair system,known as photoreactivation,can effectively repair the dimers using photolyase[7-9],which has currently been found in plants,prokaryotic and eukaryotic cells[10-12].This study was carried out to determine whether photolyase DNA repair can be observed in yeast.Several yeast Petri dishes were treated with ultraviolet radiation,different treatments were then added to them,and the colonies were counted after culturing,hence verifying that yeasts can use the photoreactivation process. 展开更多
关键词 PHOTOREACTIVATION DNA repair PHOTOLYASE
下载PDF
沉积物古DNA探秘灭绝古人类演化 被引量:2
5
作者 平婉菁 刘逸宸 付巧妹 《遗传》 CAS CSCD 北大核心 2022年第5期362-369,共8页
古DNA领域首次从世界不同洞穴遗址的沉积物里提取古核基因组以揭示相关物种演化的突破性进展,标志着沉积物古DNA研究正式进入全基因组时代。近期,一种新的沉积物古核DNA富集方法成功从西班牙Estatuas洞穴沉积物里捕获多个尼安德特人的核... 古DNA领域首次从世界不同洞穴遗址的沉积物里提取古核基因组以揭示相关物种演化的突破性进展,标志着沉积物古DNA研究正式进入全基因组时代。近期,一种新的沉积物古核DNA富集方法成功从西班牙Estatuas洞穴沉积物里捕获多个尼安德特人的核DNA,揭示该灭绝古人类群体此前未知的人口更替的历史。沉积物古核DNA富集突破了古DNA研究依赖化石材料的限制,为深入探究远古不同人类群体在更宏大时空框架下迁徙、演化与适应的历史提供了更多可能。由此,本文将着重解读该研究带来的对尼安德特人遗传历史的新认识及其方法创新的重要意义;此外还将结合人类化石DNA及其他沉积物研究所发现的灭绝古人类线粒体DNA证据,厘清尼安德特人的种群多样性及其种群间分离或替代的历史。 展开更多
关键词 沉积物古DNA 核基因组 灭绝古人类 尼安德特人 丹尼索瓦人 杂交捕获 探针组 种群替代
下载PDF
基于天牛检测的电子鼻系统设计
6
作者 江林逸 刘奕辰 陈俊良 《电子科学技术》 2017年第3期78-80,共3页
天牛是危害园林植物的主要害虫之一,植物被侵害后会产生气体。本文基于电化学气体传感器阵列、信号调理、数据采集及计算机Labview处理模块设计构建电子鼻系统;并介绍了系统的总体结构,传感器阵列、硬件电路、软件设计;最后通过配置不... 天牛是危害园林植物的主要害虫之一,植物被侵害后会产生气体。本文基于电化学气体传感器阵列、信号调理、数据采集及计算机Labview处理模块设计构建电子鼻系统;并介绍了系统的总体结构,传感器阵列、硬件电路、软件设计;最后通过配置不同气体对系统进行了定性识别实验,结果表明,所设计的电子鼻系统对天牛所产生的气体辨识率可达90%以上。 展开更多
关键词 电子鼻 传感器阵列 天牛检测 LABVIEW
下载PDF
Aptamer-Based Antibiotic Electrochemical Detection Platform Using Portable Plastic Gold Electrode and Multichannel Chip
7
作者 Yin Bao Kaiwei Cai +1 位作者 yichen liu Bingling Li 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2024年第2期171-176,共6页
The development of accurate,rapid and practical electrochemical sensing technology for antibiotic detection has an important application prospect in many fields such as food safety,environmental monitoring,medical and... The development of accurate,rapid and practical electrochemical sensing technology for antibiotic detection has an important application prospect in many fields such as food safety,environmental monitoring,medical and health care.In this research,kanamycin specific DNA aptamer and its partially complementary short chain were self-assembled onto the surface of an integrated portable plastic gold electrode(PGE)by Au-s bond,and a simple kanamycin electrochemical biosensor interface was constructed.At the same time,the epoxy resin channel layer was designed,and the auxiliary instrument was set up independently in the laboratory,which could help to measure and analyze eight groups of samples automatically in turn.The quantitative analysis results showed that in 20 min,the sensor had a good linear relationship between the peak current change of square wave voltammetry and the negative logarithm of kanamycin concentration when kanamycin concentration was in the range of 1-10o0μmol/L,and the detection limit could reach 0.40μmol/L.In addition,the discrimination could be achieved within 5 min in the real-time analysis mode.The sensor had a simple construction method,good selectivity and stability,and could be used for rapid or real-time detection of kanamycin residues in actual water samples,which provided a new direction for the practical detection of kanamycin in environmental watersamples. 展开更多
关键词 BIOSENSOR APTAMER ANTIBIOTICS ELECTROANALYSIS DNA
原文传递
Digital twin modeling and controlling of optical power evolution enabling autonomous-driving optical networks:a Bayesian approach
8
作者 Xiaomin liu Yihao Zhang +7 位作者 Yuli Chen yichen liu Meng Cai Qizhi Qiu Mengfan Fu Lilin Yi Weisheng Hu Qunbi Zhuge 《Advanced Photonics》 SCIE EI CAS CSCD 2024年第2期69-80,共12页
Optical networks are evolving toward ultrawide bandwidth and autonomous operation.In this scenario,it is crucial to accurately model and control optical power evolutions(OPEs)through optical amplifiers(OAs),as they di... Optical networks are evolving toward ultrawide bandwidth and autonomous operation.In this scenario,it is crucial to accurately model and control optical power evolutions(OPEs)through optical amplifiers(OAs),as they directly affect the signal-to-noise ratio and fiber nonlinearities.However,a fundamental contradiction arises between the complex physical phenomena in optical transmission and the required precision in network control.Traditional theoretical methods underperform due to ideal assumptions,while data-driven approaches entail exorbitant costs associated with acquiring massive amounts of data to achieve the desired level of accuracy.In this work,we propose a Bayesian inference framework(BIF)to construct the digital twin of OAs and control OPE in a data-efficient manner.Only the informative data are collected to balance the exploration and exploitation of the data space,thus enabling efficient autonomous-driving optical networks(ADONs).Simulations and experiments demonstrate that the BIF can reduce the data size for modeling erbium-doped fiber amplifiers by 80%and Raman amplifiers by 60%.Within 30 iterations,the optimal controlling performance can be achieved to realize target signal/gain profiles in links with different types of OAs.The results show that the BIF paves the way to accurately model and control OPE for future ADONs. 展开更多
关键词 optical fiber communications digital twin Bayesian inference optical amplifiers autonomous-driving optical networks
原文传递
Coexistence of multiuser entanglement distribution and classical light in optical fiber network with a semiconductor chip
9
作者 Xu Jing Cheng Qian +11 位作者 Xiaodong Zheng Hu Nian Chenquan Wang Jie Tang Xiaowen Gu Yuechan Kong Tangsheng Chen yichen liu Chong Sheng Dong Jiang Bin Niu Liangliang Lu 《Chip》 EI 2024年第2期1-10,共10页
Building communication links among multiple users in a scalable and robust way is a key objective in achieving large-scale quantum networks.In a realistic scenario,noise from the coexisting classical light is inevitab... Building communication links among multiple users in a scalable and robust way is a key objective in achieving large-scale quantum networks.In a realistic scenario,noise from the coexisting classical light is inevitable and can ultimately disrupt the entanglement.The previous significant fully connected multiuser entanglement distribution experiments are conducted using dark fiber links,and there is no explicit relation between the entanglement degradations induced by classical noise and its error rate.Here,a semiconductor chip with a high figure-of-merit modal overlap is fabricated to directly generate broadband polarization entanglement.The monolithic source maintains the polarization entanglement fidelity of above 96%for 42 nm bandwidth,with a brightness of 1.2×10^(7)Hz mW^(−1).A continuously working quantum entanglement distribution are performed among three users coexisting with classical light.Under finite-key analysis,secure keys are established and images encryption are enabled as well as quantum secret sharing between users.This work paves the way for practical multiparty quantum communication with integrated photonic architecture compatible with real-world fiber optical communication network. 展开更多
关键词 Quantum key distribution Semiconductor chip Raman noise Image encryption
原文传递
Maternal genetic history of ancient Tibetans over the past 4000 years 被引量:5
10
作者 Ganyu Zhang Can Cui +28 位作者 Shargan Wangdue Hongliang Lu Honghai Chen Lin Xi Wei He Haibing Yuan Tinley Tsring Zujun Chen Feng Yang Tashi Tsering Shuai Li Norbu Tashi Tsho Yang Yan Tong Xiaohong Wu Linhui Li Yuanhong He Peng Cao Qingyan Dai Feng liu Xiaotian Feng Tianyi Wang Ruowei Yang Wanjing Ping Ming Zhang Xing Gao yichen liu Wenjun Wang Qiaomei Fu 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2023年第10期765-775,共11页
The settlement of the Tibetan Plateau epitomizes human adaptation to a high-altitude environment that poses great challenges to human activity.Here,we reconstruct a 4000-year maternal genetic history of Tibetans using... The settlement of the Tibetan Plateau epitomizes human adaptation to a high-altitude environment that poses great challenges to human activity.Here,we reconstruct a 4000-year maternal genetic history of Tibetans using 128 ancient mitochondrial genome data from 37 sites in Tibet.The phylogeny of haplotypes M9a1a,M9a1b,D4g2,G2a’c,and D4i show that ancient Tibetans share the most recent common ancestor with ancient Middle and Upper Yellow River populations around the Early and Middle Holocene.In addition,the connections between Tibetans and Northeastern Asians vary over the past 4000 years,with a stronger matrilineal connection between the two during 4000 BPe3000 BP,and a weakened connection after 3000 BP,that are coincident with climate change,followed by a reinforced connection after the Tubo period(1400 BPe1100 BP).Besides,an over 4000-year matrilineal continuity is observed in some of the maternal lineages.We also find the maternal genetic structure of ancient Tibetans is correlated to the geography and interactions between ancient Tibetans and ancient Nepal and Pakistan populations.Overall,the maternal genetic history of Tibetans can be characterized as a long-term matrilineal continuity with frequent internal and external population interactions that are dynamically shaped by geography,climate changes,as well as historical events. 展开更多
关键词 Ancient DNA Tibetans Population history Mitochondrial genome
原文传递
与标准古DNA实验方案相关的污染物评估
11
作者 苗波 刘雅琳 +7 位作者 杨若薇 冯晓恬 刘峰 曹鹏 戴情燕 平婉菁 刘逸宸 付巧妹 《Science Bulletin》 SCIE EI CAS CSCD 2023年第1期5-9,共5页
Ancient DNA(aDNA)techniques have rapidly evolved in the past decade,including the introduction of next-generation sequencing(NGS)techniques,the modification and optimization of various protocols to extract highly degr... Ancient DNA(aDNA)techniques have rapidly evolved in the past decade,including the introduction of next-generation sequencing(NGS)techniques,the modification and optimization of various protocols to extract highly degraded DNA,and the incorporation of these molecules into sequencing libraries[1].Two major milestones are the application of single-stranded DNA library construction protocol and the automation of lab work using liquid handling robots[1]. 展开更多
关键词 AUTOMATION ANCIENT LIBRARY
原文传递
糖基聚集诱导发光材料的研究进展 被引量:2
12
作者 刘广建 冯改丽 +5 位作者 李夏芬 刘怡晨 周微 及燕铭 张媛 邢国文 《中国科学:化学》 CAS CSCD 北大核心 2022年第6期880-892,共13页
聚集诱导发光材料具有优异的光学性质,在传感检测等领域具有广泛用途.由于大部分聚集诱导发光类荧光基团具有很强的疏水性,一定程度上限制了其应用范围.近五年,基于糖类分子结构多样和水溶性好的优势,我们课题组将多种糖类物质和聚集诱... 聚集诱导发光材料具有优异的光学性质,在传感检测等领域具有广泛用途.由于大部分聚集诱导发光类荧光基团具有很强的疏水性,一定程度上限制了其应用范围.近五年,基于糖类分子结构多样和水溶性好的优势,我们课题组将多种糖类物质和聚集诱导发光分子偶联,制备出一系列糖基聚集诱导发光材料.该类材料有很好的水溶性和生物相容性,能够降低背景荧光和生物毒性.通过和目标检测物结合或者反应,实现了对多种生物活性分子的荧光检测和细胞成像.本文综述了近年来糖基聚集诱导发光材料领域的重要研究进展,以进一步拓展聚集诱导发光材料的应用领域,为生物活性物质功能监测和糖化学生物学的研究等提供有效的研究工具. 展开更多
关键词 糖类 聚集诱导发光 荧光检测 细胞成像 凝集素
原文传递
Long-and short-chain AHLs affect AOA and AOB microbial community composition and ammonia oxidation rate in activated sludge 被引量:13
13
作者 Jie Gao Yu Duan +5 位作者 Ying liu Xuliang Zhuang yichen liu Zhihui Bai Wenlin Ma Guoqiang Zhuang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2019年第4期53-62,共10页
Quorum sensing(QS)regulation of the composition of ammonia-oxidising archaea(AOA)and ammonia-oxidising bacteria(AOB)communities and functions in wastewater treatment was investigated.Specifically,we explored the role ... Quorum sensing(QS)regulation of the composition of ammonia-oxidising archaea(AOA)and ammonia-oxidising bacteria(AOB)communities and functions in wastewater treatment was investigated.Specifically,we explored the role of N-acyl-L-homoserine lactones(AHLs)in microbial community dynamics in activated sludge.On average,the specific ammoniaoxidising-rate increased from 1.6 to 2.8 mg NH_4^+-N/g MLSS/hr after treatment with long-chain AHLs for 16 days,and the addition of AHLs to sludge resulted in an increased number of AOA/AOB amoA genes.Significant differences were observed in the AOA communities of control and AHL-treated cultures,but not the AOB community.Furthermore,the dominant functional AOA strains of the Crenarchaeota altered their ecological niche in response to AHL addition.These results provide evidence that AHLs play an important role in mediating AOA/AOB microbial community parameters and demonstrate the potential for application of QS to the regulation of nitrogen compound metabolism in wastewater treatment. 展开更多
关键词 QUORUM sensing Activated sludge Ammonia-oxidising ARCHAEA Ammonia-oxidising bacteria Nitrogen removal Community composition
原文传递
A review on emulsification via microfluidic processes 被引量:5
14
作者 yichen liu Yongli Li +4 位作者 Andreas Hensel Juergen JBrandner Kai Zhang Xiaoze Du Yongping Yang 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2020年第3期350-364,共15页
Emulsion is a disperse system with two immiscible liquids,which demonstrates wide applications in diverse industries.Emulsifcation technology has advanced well with the development of microfluidic process.Compared to ... Emulsion is a disperse system with two immiscible liquids,which demonstrates wide applications in diverse industries.Emulsifcation technology has advanced well with the development of microfluidic process.Compared to conventional methods,the micro-fluidics-based process can produce controllable droplet size and distribution.The droplet formation or breakup is the result of combined effects resulting from interfacial tension,viscous,and inertial forces as well as the forces generated due to hydrodynamic pressure and extermal stimuli.In the current study,typical microfluidic systems,including microchannel array,T-shape,flow-focusing,co-flowing,and membrane systems,are reviewed and the corresponding mechanisms,fow regimes,and main parameters are compared and summarized. 展开更多
关键词 MICROFLUIDICS EMULSIFICATION capillary num-ber droplet breakup
原文传递
Maternal genetic history of southern East Asians over the past 12,000 years 被引量:3
15
作者 Yalin liu Tianyi Wang +15 位作者 Xichao Wu Xuechun Fan Wei Wang Guangmao Xie Zhen Li Qingping Yang Peng Cao Ruowei Yang Feng liu Qingyan Dai Xiaotian Feng Wanjing Ping Bo Miao Yun Wu yichen liu Qiaomei Fu 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2021年第10期899-907,共9页
Southern East Asia,including Guangxi and Fujian provinces in China,is home to diverse ethnic groups,languages,and cultures.Previous studies suggest a high complexity regarding population dynamics and the history of so... Southern East Asia,including Guangxi and Fujian provinces in China,is home to diverse ethnic groups,languages,and cultures.Previous studies suggest a high complexity regarding population dynamics and the history of southern East Asians.However,large-scale genetic studies on ancient populations in this region are hindered by limited sample preservation.Here,using highly efficient DNA capture techniques,we obtain 48 complete mitochondrial genomes of individuals from Guangxi and Fujian in China and reconstruct their maternal genetic history over the past 12,000 years.We find a strong connection between southern East Asians dating to~12,000-6000 years ago and present-day Southeast Asians.In addition,stronger genetic affinities to northern East Asians are observed in historical southern East Asians than Neolithic southern East Asians,suggesting increased interactions between northern and southern East Asians over time.Overall,we reveal dynamic connections between ancient southern East Asians and populations located in surrounding regions,as well as a shift in maternal genetic structure within the populations over time. 展开更多
关键词 Ancient DNA Southern East Asians Population history Maternal genetic structure
原文传递
Maternal genetic structure in ancient Shandong between 9500 and 1800 years ago 被引量:2
16
作者 Juncen liu Wen Zeng +21 位作者 Bo Sun Xiaowei Mao Yongsheng Zhao Fen Wang Zhenguang Li Fengshi Luan Junfeng Guo Chao Zhu Zimeng Wang Chengmin Wei Ming Zhang Peng Cao Feng liu Qingyan Dai Xiaotian Feng Ruowei Yang Weihong Hou Wanjing Ping Xiaohong Wu E.Andrew Bennett yichen liu Qiaomei Fu 《Science Bulletin》 SCIE EI CSCD 2021年第11期1129-1135,M0004,共8页
Archaeological and ancient DNA studies revealed that Shandong,a multi-culture center in northern coastal China,was home to ancient populations having ancestry related to both northern and southern East Asian populatio... Archaeological and ancient DNA studies revealed that Shandong,a multi-culture center in northern coastal China,was home to ancient populations having ancestry related to both northern and southern East Asian populations.However,the limited temporal and geographical range of previous studies have been insufficient to describe the population history of this region in greater detail.Here,we report the analysis of 86 complete mitochondrial genomes from the remains of 9500 to 1800-year-old humans from12 archaeological sites across Shandong.For samples older than 4600 years before present(BP),we found haplogroups D4,D5,B4 c1,and B5 b2,which are observed in present-day northern and southern East Asians.For samples younger than 4600 BP,haplogroups C(C7 a1 and C7 b),M9(M9 a1),and F(F1 a1,F2 a,and F4 a1)begin to appear,indicating changes in the Shandong maternal genetic structure starting from the beginning of the Longshan cultural period.Within Shandong,the genetic exchange is possible between the coastal and inland regions after 3100 BP.We also discovered the B5 b2 lineage in Shandong populations,with the oldest Bianbian individual likely related to the ancestors of some East Asians and North Asians.By reconstructing a maternal genetic structure of Shandong populations,we provide greater resolution of the population dynamics of the northern coastal East Asia over the past nine thousand years. 展开更多
关键词 Ancient DNA Human Mitochondrial DNA East Asia NEOLITHIC
原文传递
Thermoelectric performance enhancement by manipulation of Sr/Ti doping in two sublayers of Ca_(3)Co_(4)O_(9) 被引量:2
17
作者 Li ZHANG yichen liu +8 位作者 Thiam Teck TAN Yi liu Jian ZHENG Yanling YANG Xiaojiang HOU Lei FENG Guoquan SUO Xiaohui YE Sean LI 《Journal of Advanced Ceramics》 SCIE CAS CSCD 2020年第6期769-781,共13页
Thermoelectric(TE)performance of Ca_(3)Co_(4)O_(9)(CCO)has been investigated extensively via a doping strategy in the past decades.However,the doping sites of different sublayers in CCO and their contributions to the ... Thermoelectric(TE)performance of Ca_(3)Co_(4)O_(9)(CCO)has been investigated extensively via a doping strategy in the past decades.However,the doping sites of different sublayers in CCO and their contributions to the TE performance remain unrevealed because of its strong correlated electronic system.In this work,Sr and Ti are chosen to realize doping at the[Ca_(2)CoO_(3)]and[CoO_(2)]sublayers in CCO.It was found that figure of merit(ZT)at 957 K of Ti-doped CCO was improved 30% than that of undoped CCO whereas 1 at% Sr doping brought about a 150% increase in ZT as compared to undoped CCO.The significant increase in electronic conductivity and the Seebeck coefficient are attributed to the enhanced carrier concentration and spin-entropy of Co^(4+) originating from the Sr doping effects in[Ca_(2)CoO_(3)]sublayer,which are evidenced by the scanning electron microscope(SEM),Raman,Hall,and X-ray photoelectron spectroscopy(XPS)analysis.Furthermore,the reduced thermal conductivity is attributed to the improved phonon scattering from heavier Sr doped Ca site in[Ca_(2)CoO_(3)]sublayer.Our findings demonstrate that doping at Ca sites of[Ca_(2)CoO_(3)]layer is a feasible pathway to boost TE performance of CCO material through promoting the electronic conductivity and the Seebeck coefficient,and reducing the thermal conductivity simultaneously.This work provides a deep understanding of the current limited ZT enhancement on CCO material and provides an approach to enhance the TE performance of other layered structure materials. 展开更多
关键词 layered structures manipulation doping sites Ca_(3)Co_(4)O_(9)(CCO) spin-entropy thermoelectric performance
原文传递
MicroRNA-9 as a paradoxical but critical regulator of cancer metastasis:Implications in personalized medicine 被引量:2
18
作者 yichen liu Qiong Zhao +2 位作者 Tao Xi Lufeng Zheng Xiaoman Li 《Genes & Diseases》 SCIE 2021年第6期759-768,共10页
Metastasis,is a development of secondary tumor growths at a distance from the primary site,and closely related to poor prognosis and mortality.However,there is still no effective treatment for metastatic cancer.Theref... Metastasis,is a development of secondary tumor growths at a distance from the primary site,and closely related to poor prognosis and mortality.However,there is still no effective treatment for metastatic cancer.Therefore,there is an urgent need to find an effective therapy for cancer metastasis.Plenty of evidence indicates that miR-9 can function as a promoter or suppressor in cancer metastasis and coordinate multistep of metastatic process.In this review,we summarize the different roles of miR-9 with the corresponding molecular mechanisms in metastasis of twelve common cancers and the multiple mechanisms underlying miR-9-mediated regulation of metastasis,benefiting the further research of miR-9 and metastasis,and hoping to bridge it with clinical applications. 展开更多
关键词 Cancer Metastasis MIR-9 ONCOGENE Tumor suppressor
原文传递
创新管理会计 助推业财融合--以徐工集团A公司“5+2”数字化预算管理实践为例 被引量:1
19
作者 刘兴锋 沈亮亮 +1 位作者 缪银昌 刘一晨 《中国管理会计》 2021年第3期64-77,共14页
激烈的市场竞争以及高度不确定的外部环境要求企业必须创新管理,提高应变和控制能力从而打造核心竞争优势。“5+2”数字化预算管理坚持战略导向和价值引领,严格遵循“目标一活动一因素一项目一责任”的管理逻辑,聚焦核心业努活动和关键... 激烈的市场竞争以及高度不确定的外部环境要求企业必须创新管理,提高应变和控制能力从而打造核心竞争优势。“5+2”数字化预算管理坚持战略导向和价值引领,严格遵循“目标一活动一因素一项目一责任”的管理逻辑,聚焦核心业努活动和关键影响因素,突出全员、全过程、全价值链,纵向到底、横向到边,优化了资源配置效率,推动经营管理向数字化转型,加强了业财融合的深度和广度,提升了企业经营管理的效率和效益。 展开更多
关键词 战略导向 价值引领 资源配置 数字化转型 业财融合
原文传递
Ancient DNA reveals the maternal genetic history of East Asian domestic pigs
20
作者 Ming Zhang yichen liu +23 位作者 Zhipeng Li Peng Lü Jacob D.Gardner Maolin Ye Jihuai Wang Miaomiao Yang Jing Shao Weilin Wang Qingyan Dai Peng Cao Ruowei Yang Feng liu Xiaotian Feng Lizhao Zhang Enwei Li Yunzheng Shi Zehui Chen Shilun Zhu Weiwei Zhai Tao Deng Ziyuan Duan E.Andrew Bennett Songmei Hu Qiaomei Fu 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2022年第6期537-546,共10页
Zoo-archaeological and genetic evidence suggest that pigs were domesticated independently in Central China and Eastern Anatolia along with the development of agricultural communities and civilizations.However,the gene... Zoo-archaeological and genetic evidence suggest that pigs were domesticated independently in Central China and Eastern Anatolia along with the development of agricultural communities and civilizations.However,the genetic history of domestic pigs,especially in China,has not been fully explored.In this study,we generate 42 complete mitochondrial DNA sequences from~7500-to 2750-year-old individuals from the Yellow River basin.Our results show that the maternal genetic continuity of East Asian domestic pigs dates back to at least the Early to Middle Neolithic.In contrast,the Near Eastern ancestry in European domestic pigs saw a near-complete genomic replacement by the European wild boar.The majority of East Asian domestic pigs share close haplotypes,and the most recent common ancestor of most branches dates back to less than 20,000 years before present,inferred using new substitution rates of whole mitogenomes or combined protein-coding regions.Two major population expansion events of East Asian domestic pigs coincided with changes in climate,widespread adoption of introduced crops,and the development of agrarian societies.These findings add to our understanding of the maternal genetic composition and help to complete the picture of domestic pig evolutionary history in East Asia. 展开更多
关键词 Ancient mitogenomes Sus scrofa Pig domestication Genetic history East Asia
原文传递
上一页 1 2 下一页 到第
使用帮助 返回顶部